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Re: [libvirt] [RFC] New API to retrieve node CPU map

On 10/11/2012 03:15 PM, Viktor Mihajlovski wrote:
On 10/11/2012 02:27 PM, Eric Blake wrote:

That starts to feel rather complex.
well :-)

On the other hand, you have a point that returning maplen (number of
bytes allocated in the map) does NOT tell you how many cpus are online
without doing a population count of the result; worse, it cannot tell
you how many cpus are offline (a maplen of 1 is returned whether I have
4 cpus or 8 cpus, so if the map contains the value 0xb, does that mean I
had a 4 cpu machine with cpu2 off, or an 8 cpu machine with cpu2 and
cpu4-7 off?).  So allowing the user to optionally ask how many cpus are
online or offline might indeed also be useful, in addition to the maplen
needed to return the bitmap.

I actually thought of returning the number of CPUs, i.e. relevant bits which
of course makes either 'online' or 'offline' redundant.
The maplen - if of interest - can be computed by VIR_CPU_MAPLEN.

I have a process question as the implementation I have posted on the list at
would need a rebase because of upstream conflicts.
Should I send out new rebased versions once in a while, even if I have no other changes or should I wait for initial feedback before producing a new patch version?


Mit freundlichen Grüßen/Kind Regards
   Viktor Mihajlovski

IBM Deutschland Research & Development GmbH
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